Measures for controlling large deformations of underground caverns under high in-situ stress condition – A case study of Jinping I hydropower station
| Autor: | Zhongxu Liu, Xuemin Feng, Dewen Cai, Chenggang Liao, Yunhao Yang, Shengwu Song |
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| Rok vydání: | 2016 |
| Předmět: |
0211 other engineering and technologies
02 engineering and technology Classification of discontinuities Deformation (meteorology) 010502 geochemistry & geophysics 01 natural sciences Jinping I hydropower station Arch dam lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction Rock mechanics Rock mass rating Geotechnical engineering Rock mass classification Hydropower 021101 geological & geomatics engineering 0105 earth and related environmental sciences High in-situ stress Large deformation business.industry Excavation Geotechnical Engineering and Engineering Geology lcsh:TA703-712 business Large-scale underground caverns Deformation controlling technologies Geology |
| Zdroj: | Journal of Rock Mechanics and Geotechnical Engineering, Vol 8, Iss 5, Pp 605-618 (2016) |
| ISSN: | 1674-7755 |
| DOI: | 10.1016/j.jrmge.2016.06.002 |
| Popis: | The Jinping I hydropower station is a huge water conservancy project consisting of the highest concrete arch dam to date in the world and a highly complex and large underground powerhouse cavern. It is located on the right bank with extremely high in-situ stress and a few discontinuities observed in surrounding rock masses. The problems of rock mass deformation and failure result in considerable challenges related to project design and construction and have raised a wide range of concerns in the fields of rock mechanics and engineering. During the excavation of underground caverns, high in-situ stress and relatively low rock mass strength in combination with large excavation dimensions lead to large deformation of the surrounding rock mass and support. Existing experiences in excavation and support cannot deal with the large deformation of rock mass effectively, and further studies are needed. In this paper, the geological conditions, layout of caverns, and design of excavation and support are first introduced, and then detailed analyses of deformation and failure characteristics of rocks are presented. Based on this, the mechanisms of deformation and failure are discussed, and the support adjustments for controlling rock large deformation and subsequent excavation procedures are proposed. Finally, the effectiveness of support and excavation adjustments to maintain the stability of the rock mass is verified. The measures for controlling the large deformation of surrounding rocks enrich the practical experiences related to the design and construction of large underground openings, and the construction of caverns in the Jinping I hydropower station provides a good case study of large-scale excavation in highly stressed ground with complex geological structures, as well as a reference case for research on rock mechanics. |
| Databáze: | OpenAIRE |
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